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"Ochiru" is a song composed, sung, and illustrated by Hinata Haruhana; it's her seventh work in 2010, the previous being "Boku to Michizure no Uta". The song was first published on June 27th 2010 (currently the original video is unlisted). It's featured in the album "Mado to Hekimen no Accord" on January 10th 2012, and the album version was later uploaded on August 20th 2014.

The song tells Mai and how she fell in love with someone (hinted by the ringing of a phone; it's presumably related to "Denwa ga Naru"; making the man in the song Narumiya Mafuyu).